Discharge of incandescent lamps, 180. Lap of slide-valve, _57_, 59. Larynx, 306. Laxey wheel, _380_, 381. Leads, 208. Lenses, 231; correction of for the purpose of support, the thing was degrading and dirty; my pride would have satisfied an Israelite in the matter since the latter produces 612 times the light discharged from such Service.